Prometheus | liebprom06: Being a Titan, Prometheus should be immortal by birth. Yet, some affirm that Prometheus was granted immortality, after Heracles shot the Centaur Chiron with a poisoned arrow. The wound proved incurable, and Chiron wished to die, but being immortal, he could not. It was then that Prometheus offered himself to Zeus to be immortal in his stead, and the request being granted by the god, Chiron died and Prometheus obtained immortality. "You also, dear father, who are now immortal and destined by the law of birth to last through all the ages, shall some day long for power to die, when you will be in agony with all your limbs burning with the fatal Hydra's blood. But at last, from immortal the gods shall make you capable of death, and the three goddesses shall loose your thread." (Ocyrrhoe to Chiron. Ovid, Metamorphoses 2.649). Liebig sets.